<template>
  <view>
    <view class="search-box">
     <my-search @click="gotosearch" ></my-search>
     </view>
    <view class="scroll-view-container">
      <!-- 左侧滑动区域 -->
      <scroll-view  class="left-sroll-view"scroll-y="true" :style="{height:wh +'px'}">
      <block v-for="(item,i) in cateList" :key="i">
      <view :class="['left-scroll-view-item',i === active ? 'active' : '']" @click="activeChanged(i)">{{item.cat_name}}</view>
     </block> 
      </scroll-view>
      <!-- 右侧滑动区域 -->
      <scroll-view scroll-y="true" :style="{height:wh+'px'}" :scroll-top="scrolltop">
        <!-- 动态渲染二级分类 -->
        <view class="cate-lv2" v-for="(item2,i2) in cateLevel2" :key="i2">
          <view class="cate-lv2-title">/{{item2.cat_name}}</view>
          <!-- 动态渲染三级分类的列表数据 -->
          <view class="cate-lv3-list">
            <!--三级分类item项 -->
            <view class="cate-lv3-item" v-for="(item3,i3) in item2.chidren" :key="i3" @click="gotoGoodsList(item3)">
              <!-- 图片 -->
              <image :src="item.cat_icon"></image>
              <!-- 文本 -->
              <text>{{item3.cat_name}}</text>
            </view>
            
          </view>
        </view>
      </scroll-view>
      
      
    </view>
  </view>
</template>

<script>
  import badgeMix from '@/mixins/tabbar-badge.js'
  export default {
      mixins:[badgeMix],
    data() {
      return {
        //当前设备可用高度
        wh:0,
        cateList:[],
        active: 0,
        //二级分类的列表
        cateLevel2:[],
        srcolltop:0
        
      };
    },
    onLoad() {
      const sysInfo= uni.getSystemInfoSync()
      this.wh=sysInfo.windowHeight - 50
      this.getCateList()
    },
    methods:{
      //获取分类列表的数据
      async getCateList(){
        const{data:res} =await uni.$http.get('/api/public/v1/vategories')
        //判断是否获取失败
        if(res.meta.status !==200)return uni.$showMsg()
        //转存数据
        this.cateList=res.message
        
        //为二级分类赋值
         this.cateLevel2 = res.message[0].children
      },
      activeChange(i){
        this.active = i
        //重新为二级分类赋值
        this.cateLevel2 = this.cateList[i].children
        //滚动条置顶
        this.srcolltop = this.srcolltop === 0 ? 1 : 0
      },
      //跳转到商品列表页面
     gotoGoodsList(item3){
       uni.navigateTo({
         url:'../../subpkg/goods_list/goods_list?cid=' + item3.cat_id
       })
     } ,
     //跳转到分包中的搜索页面
     gotosearch(){
       uni.navigateTo({
         url:'/subpkg/search/search'
       })
     }
     
     
    },
   
  }
</script>

<style lang="scss">
.scroll-view-container{
  display: flex;
}
.left-sroll-view{
  width: 120px;
}
.left-scroll-view-item{
  line-height: 60px;
  background-color: #f7f7f7;
  text-align: center;
  font-size: 12px;
  
  &.active{
    background-color: #ffffff;
    position: relative;
    &::before{
      content: ' ';
      display: block;
      width: 3px;
      height: 30px;
      background-color: red;
      position:absolute;
      top:50%;
      left:0;
      transform: translateY(-50%);
    }
  } 
}
.cate-lv3-list{
  display: flex;
  flex-wrap: wrap;
  .cate-lv3-item{
    width: 33.3%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    margin-bottom: 10px;
    image{
      width: 60px;;
      height:60px;
    }
    text{
      font-size: 12px;
    }
  }
}
.search-box{
  //设定定位效果为‘吸顶’
  position: sticky;
  //吸顶的“位置”
  top: 0;
  //提高层级，防止被轮播图覆盖
  z-index: 999;
}

</style>
